Has anybody ever used a 2600mAh-Battery in a 9800 Torch and if so do the 2600mAh-Batterys last longer ... thx

I wouldn't do that if I were you unless you want to damage your Torch. Right now to my knowledge there is no extended life battery for the Torch.

actually there are plenty of extended batteries for the torch just do a "torch extended battery" search in amazon,com and you'll see some including a 5000mAh battery which i didn't know existed.

Amazon.com: torch extended battery


well, the numbers would say it lasts longer so i assume it does. There's alos a 2800mAz battery u may wanna look into. ive used a seidio extended battery but for my 8300 back in the day and it definitely lasted longer. Much longer.